72022388 has 18 divisors (see below), whose sum is σ = 133024626. Its totient is φ = 34115184.

The previous prime is 72022373. The next prime is 72022417. The reversal of 72022388 is 88322027.

It can be written as a sum of positive squares in only one way, i.e., 41242084 + 30780304 = 6422^2 + 5548^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23495 + ... + 26382.

It is an arithmetic number, because the mean of its divisors is an integer number (7390257).

Almost surely, 2^72022388 is an apocalyptic number.

It is an amenable number.

72022388 is a deficient number, since it is larger than the sum of its proper divisors (61002238).

72022388 is a wasteful number, since it uses less digits than its factorization.

72022388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49919 (or 49898 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 72022388 is about 8486.6004972545. The cubic root of 72022388 is about 416.0598795092.

The spelling of 72022388 in words is "seventy-two million, twenty-two thousand, three hundred eighty-eight".